<!DOCTYPE html>

<html>
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <title></title>
        <meta name="description" content="">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <link rel="stylesheet" href="">
    </head>
    <body>
      
        <script>
let arraylike={
    'O':'a',
    'I':'b',
    '2':'c',
    length:3
};
var arr1=[].slice.call(arraylike);
let arr2=Array.from(arraylike);
        </script>
    </body>
</html>